Birds

Birds (Class Aves) arose in the fossil record during the Mesozoic era, about 150 to 200 million years ago. The reptilian origin of birds is evident in similarities in their skeleton; a single occipital condyle, single ear bone, and a lower jaw composed of five fused bones. Today, birds can be seen in a variety of sizes; from the small ruby-throated hummingbird, northern cardinal and the yellow-billed magpie to the large golden eagle, great blue heron and the griffon vulture. All birds have feathers, no teeth, are bipedal, have pneumatic bones (bones that are hollow) and have forelimbs specialized for flight. Ornithologists believe there are about 10,000 bird species in the world with new species discovered all the time. The migratory nature of birds is evident in the various landscapes they can be found; from arid deserts and mountain tops to arctic ice fields and in your own backyard.

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